Public management scholars are interested in the ways that public managers can improve the performance of their organizations and, by extension, public service outcomes. However, public sector outcomes are increasingly being produced by nonprofit organizations. Nonprofits have encountered increased pressures to improve effectiveness in recent years, both from their funding entities and from the public. A growing body of public management research has shown that managerial networking can pay dividends for organizational effectiveness, yet no studies to date have considered the effects of managerial networking on nonprofit effectiveness. This is the first study to apply the basic elements of Meier and O'Toole's model to the nonprofit sector. Using survey data from a random sample of 314 nonprofit human service organizations in 16 U.S. states, the authors explore the frequency of various networking relationships on organizational and advocacy effectiveness. The findings reveal that political networking increases advocacy effectiveness and community networking increases organizational effectiveness.